1. KINGDOM ANIMALIA
NON – CHORDATES
CLASS 9

2. GENERAL FEATURES Eukaryotic Multicellular Heterotrophic No cell wall
Mostly mobile

3. Two types
Non – chordates or invertebrates
Chordates or vertebrates

4. Porifera or sponges Organisms with holes or pores all over the body.
Non motile animals – attached to some solid support.
Canal system of circulation because of pores for circulating water throughout the body to bring in food and oxygen.
Covered with hard outer or exoskeleton.
Minimal differentiation and division into tissues.
Marine habitats

5. sycon
euplectela
spongilla

6. Coelenterata (cnidaria)
Live in water
More body design differentiation
Presence of a body cavity
2 layers of body cells – a layer outside the body and the inner lining of cells.
Some species live in colonies like corals
Others are solitary like hydra.

7. hydra
corals
Sea anemone
Jelly fish

8. platyhelminthes More complex design of body.
Bilateral symmetry of body – left and right halves of body have same design.
Triploblastic – 3 layers of cells from which tissues are differentiated. This allows inside and outside body linings and some organs to be made.
No coelom or internal body cavity.
Called flatworms - Dorsiventrally flattened body ( flattened from top to bottom)
Either free living (like Planaria) or parasitic (like liver fluke)

9. planaria
Liverfluke
tapeworm

10. nematoda elephantiasis Filarial worms Worms in intestine
Bilaterally symmetrical
Triploblastic
Cylindrical body
Tissues present, no real organs
Pseudo coelom or a sort of body cavity is present.
Parasitic worms causing diseases.
Worms in intestine
elephantiasis
Filarial worms
Worms in intestine
Roundworm or pinworms

11. ascaris
wuchereria

12. annelida Bilaterally symmetrical Triploblastic
Have a true body cavity – true organs packaged inside the body – extensive organ differentiation.
Body has segments lined up from head to tail.
Habitats – freshwater, marine water, land

13. nereis
earthworm
leech

14. arthropoda Largest group of animals Bilaterally symmetrical
Segmented body
Open circulatory system – blood does not flow in blood vessels, blood fills the coelomic cavity
Have jointed legs (arthro + poda)

15. Palamnaeus
(scorpion)
Pariplaneta
(cockroach)
Palaemon (prawn)
Musca (housefly)
Aranea (spider)
Scolopendra
(centipede)
butterfly

16. mollusca Bilateral symmetry Coelomic cavity is reduced
Little segmentation
Open circulatory system
Have kidney like organs for excretion
Foot is used for moving around.

17. chiton
pila
Unio
octopus

18. echinodermata In Greek, echinos means hedgehog, derma means skin.
Spiny skinned organisms.
Free living
Marine
Triploblastic
Have a coelomic cavity.
Tube system which is water driven for moving around.
Skeleton made by hard structures made of calcium carbonate.

19. Antedon (Feather star)
Holothuria (sea cucumber)
Asterias
(star fish)
Echinus (sea urchin)

20. protochordata Bilaterally symmetrical Triploblastic Have a coelom
Have a notochord at some stages of their life
Notochord = long rod like structure that runs along the back of the animal separating the nervous tissue from the gut.
Provides a place for muscles to attach for movement.
Marine animals

21. Balanoglossus
Herdmania
Amphioxus